Nutrition
Heat Stress Hydration
Heat stress hydration replaces sweat fluid and sodium during hot exercise or sauna. Electrolytes matter when sweat losses are heavy; water alone may fall short.
Heat stress hydration replaces sweat losses with fluids and electrolytes—sodium chiefly—during hot training or sauna blocks. Plain water alone can dilute sodium if you sweat heavily for hours.
Drink to thirst plus planned sips on long sessions; urine pale straw is a rough guide.
Common questions
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Do you need sports drinks in heat?
Sessions over an hour or heavy sweaters often need sodium; shorter easy sessions may only need water. Avoid excess sugar unless fueling endurance.
Related terms
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